Fix fixtures order for influxdb failover tests

- Use sl_os_deployed fixture as the last 'reverting'
  fixture in the fixture list for test cases,
  then it will revert the latest necessary snapshot
  instead of using intermediate snapshots.

- remove outdated template for model virtual-mcp-ocata-cicd
  related patch: https://gerrit.mcp.mirantis.net/#/c/12881
- remove DHCP settings for ens4 (private interface) to
  not affect keepalived that is configured for ens4 on most
  of labs
- remove workaround for keepalived with 100000 tries

- set pytest version <=3.2.5 in requirements.txt
  In the 3.3.0, requests.session._fixturemanager.getfixtureinfo()
  returns the fixtures only for limited context for the
  first fixture occurance, without collecting all the data.

Closes-Bug: https://mirantis.jira.com/browse/PROD-15791

Change-Id: Ifc29a79febdf910944b3ffe996dde7d640331d5d
diff --git a/tcp_tests/requirements.txt b/tcp_tests/requirements.txt
index 8c30994..d0260f2 100644
--- a/tcp_tests/requirements.txt
+++ b/tcp_tests/requirements.txt
@@ -5,7 +5,7 @@
 six
 requests>=2.2.0
 oslo.config>=3.12.0 # Apache-2.0
-pytest>=2.9
+pytest>=2.9,<=3.2.5
 docker-py
 docker-compose==1.7.1
 urllib3